Shutter



FIG. 1 is a front elevatonal view of a shutter showing my new design;

FIG. 2 is a side elevational view thereof as seen from the right-hand side of FIG. 1;

FIG. 3 is a bottom plan view thereof as seen from the bottom of FIG. 1; and

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a shutter, substantially as shown. 